package com.atguigu.gulimall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        List<CategoryEntity> lis = baseMapper.selectList(null);
        List<CategoryEntity> level1 = lis.stream().
                filter(a->a.getParentCid()==0)
                .map((menu)->{
                    menu.setChildren(getChildren(menu,lis));
                    return menu;
                }).sorted((a,b)->(a.getSort()==null?0:a.getSort())-(b.getSort()==null?0:b.getSort())).collect(Collectors.toList());
        return level1;
    }

    public List<CategoryEntity> getChildren(CategoryEntity root,List<CategoryEntity> all){
        return all.stream().filter(c->c.getParentCid()==root.getCatId())
                .map((menu)->{
                    menu.setChildren(getChildren(menu,all));
                    return menu;
                }).sorted((a,b)->(a.getSort()==null?0:a.getSort())-(b.getSort()==null?0:b.getSort()))
                .collect(Collectors.toList());
    }

}